Adjuvants augment the immunogenicity of vaccines when co-administered with messenger RNA (mRNA) antigens. In recent years, nanotechnology and nanoscience have seen significant growth, resulting in the discovery of synthetic small molecule compounds, natural extracts, and nanomaterials with self-adjuvant properties for nano delivery. The materials exhibit robust immune activity and efficiently activate various innate immune signaling pathways. Moreover, they possess a comparatively simple chemical composition in contrast to conventional adjuvants. This significantly streamlines the manufacturing process of vaccine formulations. Therefore, these self-adjuvant materials theoretically improve the reproducibility of adjuvant production and quality control. Herein, this review summarizes the current research and development progress of mRNA adjuvants, with a specific focus on various types of mRNA adjuvants, notably self-adjuvant nanomaterials. It discusses the current research status on a range of diseases and investigates the potential development of mRNA vaccine adjuvants.
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